CM LoRa/LoRaWAN tutorial 46
CM https://www.mobilefish.com/developer/lorawan/lorawan_quickguide_tutorial.html
CM https://www.mobilefish.com/download/lora/collinear_868mhz_4nec2.nec.txt
CM Collinear antenna with 3 helixes and 4 radials 
CM To be used in 4NEC2 with support for SY cards
CM Helix diameter diam = 18.8mm
CM Helix wire diameter d = 1.8mm
CM Helix wire radius r = d/2 = 0.9mm
CM Helix radius hr = (diam-d) / 2 = 8.5mm
CM Number of turns n = 1
CM Spacing between turns spacing = 2.8mm
CM Wire length bottom wla = 175mm
CM Wire length middle wlb = 259mm
CM Wire length top wlc = 249mm
CM Wire length radials rad = 99mm
CM Wire a,b,c has an x offset = 8.5mm
CM Four radials has an x offset = 8.5mm
CM Frequency freq = 868.0 MHz
CM feedpoint is located at the bottom of the bottom wire
CM -----
SY height=11.0
SY spacing=0.0028
SY diameter=0.0018
SY wla=0.175
SY wlb=0.259
SY wlc=0.249
SY hr=0.0085
SY r=diameter/2
SY da=height+wla
SY db=da+spacing
SY dc=db+wlb 
SY dd=dc+spacing
SY de=dd+wlc
SY rad=0.099
SY hrrad1=hr+rad
SY hrrad2=hr-rad
SY freq=868.0
CE
'Helix bottom
GH	1	9	spacing	spacing	hr	hr	hr	hr	r
GM	0	0	0	0	0	0	0	da	1
'Helix middle
GH	2	9	spacing	spacing	hr	hr	hr	hr	r
GM	0	0	0	0	0	0	0	dc	2
'Helix top
GH	3	9	spacing	spacing	hr	hr	hr	hr	r
GM	0	0	0	0	0	0	0	de	3
'Wire bottom
GW	5	31	hr	0	height	hr	0	da	r 
'Wire middle
GW	6	47	hr	0	db	hr	0	dc	r
'Wire top
GW	7	45	hr	0	dd	hr	0	de	r
'Radial X
GW	8	17	hr	0	height	hrrad1	0	height	r
'Radial Y
GW	9	17	hr	0	height	hr	rad	height	r
'Radial -X
GW	10	17	hr	0	height	hrrad2	0	height	r
'Radial -Y
GW	11	17	hr	0	height	0	-rad	height	r
GE	0
GN	2	0	0	0	3	0.0001
EK
'Radiator (copper)
LD	5	1	0	0	58000000
LD	5	2	0	0	58000000
LD	5	3	0	0	58000000
LD	5	5	0	0	58000000
LD	5	6	0	0	58000000
LD	5	7	0	0	58000000
'Radials (stainless steel)
LD	5	8	0	0	1390000
LD	5	9	0	0	1390000
LD	5	10	0	0	1390000
LD	5	11	0	0	1390000

EX	0	5	1	0	1	0
FR	0	1	0	0	freq	0
EN